What Is a Solid State Drive (SSD), and Do I Need One?

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Solid State Drives (SSDs) are the lighting fast counterpart to the traditional hard drive with moving parts. But are they a good match for you? Read on as we demystify SSDs.

The last few years have seen a marked increase in the availability of SSDs. They’ve also shown a dramatic decrease in price, even though they’re still costlier than traditional drives. What is an SSD? In what ways do you benefit the most from paying the premium for an SSD? What, if anything, do you need to do differently with an SSD? Read on as we cut through haze surrounding Solid State Drives.

What Is a Solid State Drive?

This might be hard to believe, but Solid State Drives are actually fairly old technology. SSDs have been around for decades in various forms. The earliest were RAM-based and were so cost-prohibitive as to make appearances only in ultra high-end and super computers. In the 1990s, Flash-based SSDs made an appearance but were still far too expensive for the consumer market and made hardly a blip outside of specialized computing circles. Throughout the 2000s, the price of flash memory continued to fall, and by the end of the decade, consumer Solid State Drives were making inroads in the personal computer market.

So what exactly is a Solid State Drive? First let’s go over what a traditional Hard Disk Drive (HDD) is. An HDD is, at its most simple, a set of metal platters coated with a ferromagnetic material. Those platters spin on a spindle (much like a record spins on a turn table). The surface of the magnetic platters is written to by a tiny little mechanical arm (the actuator arm) with a very fine tip (the head). Data is stored by changing the polarity of the magnetic bits on the surface of the platters. It is, of course, quite a bit more complicated than that, but suffice to say that the analogy of an automatic record player arm seeking out a track on a record is not far flung from the actuator arm and head of a HDD seeking out data. When you want to write or read data from a magnetic HDD, the platters spin, the head seeks, and the data is located. It’s as much a mechanical process as it is a digital one.

Solid State Drives, by contrast, have no moving parts. Although the scale is different and the size of the storage significantly larger, an SSD shares so much more in common with a simple, portable flash drive than it does with a mechanical HDD (and certainly far more than it ever would with a record player!). The vast majority of SSDs on the market are of the NAND variety, a type of non-volatile memory that doesn’t require electricity to maintain data storage capacity (unlike the RAM in your computer, which loses its stored data as soon as the power goes off). NAND memory also provides a significant increase in speed over mechanical hard drives, as the time wasted spinning up and seeking is removed from the equation.

Comparing Solid State Drives to Traditional Hard Drives

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It’s all well and good to have a handle on how SSDs work, it’s more helpful to compare them to the traditional hard drives you’ve been using for years now. Let’s look at a few key differences in a point-by-point comparison.

Spin-up Time: SSDs have no spin up time, since the drive has no moving parts. HDDs have varying spin up times—usually a few seconds—when you hear a click-whirrrrrr for a moment or two when booting your computer or accessing an infrequently-used drive.

Data Access Time and Latency: SSDs are lighting fast and generally seek on an order of 80-100 times faster than HDDs. By skipping the mechanical spin and seek routine, SSDs access data almost instantly wherever it is on the disk. HDDs are hampered by the physical movement of the armature and the spinning of the platters.

Noise: SSDs are silent; no moving parts means no noise. HDDs range from pretty-darn-quiet to very-clumsy-click-beetle levels of sound.

Reliability: Individual manufacturing issues aside (bad drives, firmware issues, etc.), SSD drives come out ahead in the physical reliability department. The vast majority of HDD failures are a result of mechanical failure. At some point, after tens of thousands of hours of operation, a mechanical drive will simply wear out. In terms of read/write life, however, HDDs win (there is no write limit on a magnetic disk, you can change the polarity and indefinite number of times).

Conversely, SSDs have a finite number of write cycles. This limited-write-cycle issue is much trumpeted by people decrying SSDs, but the reality is that the average computer user would be hard pressed to hit the ceiling of read-write cycles on a SSD. Modern SSDs like the Samsung EVO 850 (one of the more popular SSD lines), for example, can handle hundreds of TiBs of data written over a few decades of use—more use than most people will put a drive to.

Additionally, SSD drives have a pretty neat-o feature; when the sectors of the NAND modules reach the end of their write-cycle, they become read only. The drive then reads the data from the failed sector and rewrites it to a new portion of the disk. This typically gives you plenty of time to backup your data and procure a new drive.

Power Consumption: SSD drives consume 30-60% less energy than traditional HDDs. Saving an odd 6 or 10 watts here and there doesn’t seem like a lot, but over the course of a year or two on a heavily used machine, it adds up.

Cost: SSD are not as cheap as HDDs. As of the writing of this article (late 2017), traditional HDD prices have fallen to less than a nickel per GB of data. That’s astonishingly cheap by historical standards. SSDs are much cheaper than even in the past few years. Depending on the size and model, expect to pay anywhere between $0.20-$0.30 per GB (again as of late 2017). While still more expensive than HDDs, picking up an SSD for use as your main drive is hardly exorbitant.

One thing to note is that the price of SSDs tends to rise more dramatically at higher capacities. For example, you can typically pick up a 256 GB SSD for around $100, a 500 GB for around $150, and a 1 TB for under $300. However, 2 TB drives start hitting around $700 and 4 TB twice that. For this reason, a lot of people pick up a smaller SSD to use as a system drive (where Windows and many apps and games are installed), along with a bigger, less expensive HDD for file storage.

The Care and Feeding of a Solid State Drive

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In so far as running your operating system, saving data, and interacting with your computer goes, the only differences you’ll really notice while running a SSD drive are the increase in speed and the decrease in noise. When it comes to taking care of your drive, however, there are a few rules of critical importance.

RELATED: Do I Really Need to Defrag My PC?

Don’t defragment your drive. Defragmentation is useless on a SSD, and it decreases the lifespan. Defragmentation is a technique that brings the pieces of files closer together and optimizes their placement on the platters of HDDs to decrease the seek time and the wear and tear on the disk. SSDs have no platters and have a nearly instantaneous seek time. All defragging them does is chew up more of your write cycles. By default, defragmentation is disabled for SSDs in Windows.

Turn off Indexing Services: If your OS rocks any sort of search-supplementation tool like an Indexing Service (Windows does), turn it off. The read time is so fast on SSDs that you don’t really need to build a file index and the actual process of indexing the drive and writing the index is slow on SSDs.

RELATED: How to Check if TRIM Is Enabled for Your SSD (and Enable It if It Isn’t)

Your OS should support TRIM. The TRIM command allows your OS to communicate with your SSD drive and tell it which blocks are no longer in use (and are thus clear for wiping). Without the TRIM command taking care of some housekeeping on your SSD, the performance will rapidly degrade. Modern versions of Windows (7 and up), macOS (10.6.6 and up), and most Linux implementations (Linux Kernel 2.6.33+), support the TRIM command. While registry hacks and supplementary programs exist for modifying earlier OS versions like Windows XP to semi-support the TRIM command, there is no native support. Your SSD should be paired with a modern OS for maximum performance.

Leave a portion of the disk empty. Check the specs for your drive for specifics. Most manufacturers recommend keeping 10-20% of the drive empty. This empty space is there to assist the leveling algorithms (they redistribute the data across the NAND modules to minimize the total wear on the drive and ensure a long life and optimum drive performance). Too little space and the leveling algorithms work over time and prematurely wear on the drive.

Store media on a second drive: Until larger SSDs drop radically in price, it makes no sense to store your massive media files on your expensive SSD. If you’re storing multiple TB of data, pick up a large traditional HDD to use as secondary drive if possible.

Invest in RAM: Compared to the cost of SSDs, RAM is cheap. The more RAM you have, the fewer writes-to-disk you’ll have on your SSD. You’ll extend the life of your pricey SSD by ensuring your system has adequate RAM installed.

Is a Solid State Drive for Me?

At this point, you’ve got a history lesson, a point-by-point comparison, and some tips for keeping your SSD in tip-top shape, but is an SSD for you? Check all that apply and get ready to bust out your credit card:

  • You want nearly instant boot times: You can go from a cold boot to browsing the web in a matter of seconds with an SSD; the same window is often minutes with a traditional HDD.
  • You want extremely fast access for general applications and gaming: We’ve said it many times already but SSDs are blistering fast. You’ll see a dramatic speed boost to anything that requires loading from disk. This means, starting apps and games, loading big files, and loading new levels within a game all go much faster.
  • You want a quieter and less power-hungry computer: As highlighted above, SSDs are silent and use significantly less power.
  • You’re able to use two drives; one for your OS and one for your media: Unless you’re storing just a handful of family pictures and a CD rip or two, you’ll need a more affordable traditional HDD to store your big files.
  • You’re willing to pay extra for the benefits of rocking an SSD: SSDs are cheaper than they’ve ever been and are by no means outside the reach of even budget systems. But, they do still cost more than traditional SSDs.

If your checklist looks more full than empty and paying a bit extra is no big deal, then congratulations—it looks like an SSD is in your future!


Have your own SSD experiences, tips, or tricks to add? Let’s hear about them in the comments. Questions? We want to hear those too!

Jason Fitzpatrick is a warranty-voiding DIYer who spends his days cracking opening cases and wrestling with code so you don't have to. If it can be modded, optimized, repurposed, or torn apart for fun he's interested (and probably already at the workbench taking it apart). You can follow him on if you'd like.